I haven’t the Front area, but there’s a simple way to do it. Take a front picture of the car (a lot of them in the net). You have some dimensions there to get the scale, so yo have a “scale sample” of yor real front area. Now take a squared paper, and trace the contour. So you know the scale, and you only need to know how many squares. Keep in mind, bigger squares less definition (=accuracy).
The front area could be divided in big squares and you only need to "manually" count the countour ones.
It’s an old method, but could help if you do not have any other.
Good look counting squares.